FILE - In this Wednesday, May 11, 2011 file photo, American-born Islamist militant Omar Hammami, 27, also known as Abu Mansur al-Amriki, right, and deputy leader of al-Shabab Sheik Mukhtar Abu Mansur Robow, left, sit under a banner which reads "Allah is Great" during a news conference of the militant group at a farm in southern Mogadishu's Afgoye district in Somalia. A 50-member group of U.S. government workers comprised of Americans and foreign nationals called the Digital Outreach Team is countering extremist propaganda on sites like Twitter and Facebook, with the top official on the team, Alberto Fernandez, saying the goal is to contest space that had previously been ceded to extremists. (AP Photo/Farah Abdi Warsameh, File)